1.jedis簡介

jedis是一個java實現的redis客戶端連接工具。常用的還有redisson，jedis跟接近于原生的操作，而redisson跟適合用于分布式，提供了分布式鎖，以及其他多種數據結構。
jedis使用非常簡單
直接引入依賴

<dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>2.9.0</version></dependency> Jedis jedis = new Jedis("locahost",6379);

jedis使用完后記得調用其close方法釋放其資源，jedis是線程不完全，多線程使用同一個jedis實例，會出現并發問題，原因是底層共用了一個輸入輸出流。避免這個問題每次使用可以new 一個新的Jedis實例，但是創建實例的代價是昂貴的，jedis提供，jedisPool,和數據庫池，線程池的思想類似，就是保存一定的jedis實例，需要的話就拿來用。

2.簡單使用

package com.redis;import org.slf4j.Logger; import org.slf4j.LoggerFactory; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig;import java.io.*; import java.net.URL; import java.util.List; import java.util.Properties;public class JedisUtil {private final static Logger LOGGER = LoggerFactory.getLogger(JedisUtil.class);private JedisPool jedisPool = null;/*** 不存在才設置*/public static final String NX = "NX";/*** 存在才設置*/public static final String XX = "XX";//秒public static final String EX = "EX";//毫秒public static final String PX = "PX";static {}public JedisUtil() throws IOException {Properties properties = new Properties();URL resource = JedisUtil.class.getResource("redis.properties");properties.load(resource.openStream());JedisPoolConfig config = new JedisPoolConfig();Integer maxActive = Integer.parseInt(properties.getProperty("jedis.pool.maxActive"));Integer maxIdle = Integer.parseInt(properties.getProperty("jedis.pool.maxIdle"));Long maxWait = Long.parseLong(properties.getProperty("jedis.pool.maxWait"));Boolean testOnBorrow = Boolean.valueOf(properties.getProperty("jedis.pool.testOnBorrow"));Boolean testOnReturn = Boolean.valueOf(properties.getProperty("jedis.pool.testOnReturn"));config.setMaxTotal(maxActive);config.setMaxIdle(maxIdle);config.setMaxWaitMillis(maxWait);config.setTestOnBorrow(testOnBorrow);config.setTestOnReturn(testOnReturn);jedisPool = new JedisPool(config,properties.getProperty("jedis.pool.ipAddress"),Integer.parseInt(properties.getProperty("jedis.pool.port")));}private Jedis getJedis(){return jedisPool.getResource();}public String set(byte[] key, byte[] value, String nxxx, String expx,long time){Jedis jedis = null;try {jedis = jedisPool.getResource();return jedis.set(key,value,nxxx.getBytes("utf-8"),expx.getBytes("utf-8"),time);} catch (Exception e) {e.printStackTrace();} finally {returnObject(jedis);}return null;}public String setString(String key,String val){Jedis jedis = null;try {jedis = jedisPool.getResource();return jedis.set(key,val);} catch (Exception e) {e.printStackTrace();} finally {returnObject(jedis);}return null;}/*** 設置集合值* @param key* @param val* @return*/public Long lpush(byte[] key,byte[] ... val){Jedis jedis = null;try {jedis = jedisPool.getResource();return jedis.lpush(key,val);} catch (Exception e) {e.printStackTrace();} finally {returnObject(jedis);}return null;}/*** 設置集合值* @param key* @return*/public List<byte[]> getAllListValues(byte[] key){Jedis jedis = null;try {jedis = jedisPool.getResource();Object vals = jedis.eval("local len = redis.call('llen',KEYS[1]) return redis.call('lrange',KEYS[1],0,len)".getBytes(),1,key);return (List<byte[]>) vals;} catch (Exception e) {e.printStackTrace();} finally {returnObject(jedis);}return null;}public String getString(String key){Jedis jedis = null;try {jedis = jedisPool.getResource();return jedis.get(key);} catch (Exception e) {e.printStackTrace();} finally {returnObject(jedis);}return null;}/*** 返回刪除的個數* @param key* @return*/public Long del(byte[] key){Jedis jedis = null;try {jedis = jedisPool.getResource();return jedis.del(key);} catch (Exception e) {e.printStackTrace();} finally {returnObject(jedis);}return null;}public byte[] get(byte[] key){Jedis jedis = null;try {jedis = jedisPool.getResource();return jedis.get(key);} catch (Exception e) {e.printStackTrace();} finally {returnObject(jedis);}return null;}private void returnObject(Jedis jedis){if(jedis != null){jedis.close();}}/*** 序列化* @param obj* @return*/public static byte [] serialize(Object obj){ObjectOutputStream objectOutputStream=null;ByteArrayOutputStream byteArrayOutputStream=null;try {byteArrayOutputStream=new ByteArrayOutputStream();objectOutputStream=new ObjectOutputStream(byteArrayOutputStream);objectOutputStream.writeObject(obj);byte[] bytes=byteArrayOutputStream.toByteArray();return bytes;} catch (IOException e) {e.printStackTrace();}return null;}//反序列化public static Object unSerizlize(byte[] byt){ObjectInputStream objectInputStream=null;ByteArrayInputStream bis=null;bis=new ByteArrayInputStream(byt);try {objectInputStream=new ObjectInputStream(bis);Object obj=objectInputStream.readObject();return obj;} catch (Exception e) {e.printStackTrace();}return null;}}

總結

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